A fractal comminution approach to evaluate the drilling energy dissipation

被引:63
作者
Carpinteri, A [1 ]
Pugno, N [1 ]
机构
[1] Politecn Torino, Dept Struct Engn & Geotech, I-10129 Turin, Italy
关键词
D O I
10.1002/nag.209
中图分类号
P5 [地质学];
学科分类号
0709 ; 081803 ;
摘要
The drilling comminution is theoretically and experimentally analysed by a fractal approach. An extension of the Third Comminution Theory is developed to evaluate the energy dissipation in the process: it occurs in a fractal domain intermediate between a surface and a volume. The theoretical assumption of a material 'quantum' is experimentally observed. The experimental fragment analysis evidences the characteristic size of separation between primary cutting and secondary milling. A global power balance for the drilling process is also presented and permits the prediction of drilling velocity. It shows also how the dissipation energy density (drilling strength) is not a constant parameter, but decreases considerably with the size scale. Copyright (C) 2002 John Wiley Sons, Ltd.
引用
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页码:499 / 513
页数:15
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